.nav{
    height: 50px;
    width: 100%;
    background-color:#F0F0F0;
}
.nav ul{
    overflow: hidden;
}
.nav li{
    height: 100%;
    width: 50px;
    float: left;
    list-style: none;
    padding-left: 23px;
    line-height: 45px;

    background-repeat: no-repeat;
    background-size:24px; /* 确保图片适应容器 */
    background-position:left; 
}

.nav .nav-home{
    background-image: url(/img/shouye.png);
    margin-left: 10px;
    
}
.nav .nav-pictures{
    background-image: url(/img/tupian.png);
}
.nav .nav-blog{
    background-image: url(/img/rizhi.png);
}
.nav .nav-about{
    background-image: url(/img/guanyuwomen.png);
    float: right;
    margin-right: 15px;
}

a{
    text-decoration: none;
    color: black;
}